With 2 1721 routers in remote locations connected via point to point dedicated T1's. Using one T1 as a backup if needed but both are always (should be) connected.
According to ATT the lines are good, according to Cisco TAC the configurations should work, however, when I connect the second T1 to the second wic the line is up and the protocol is up for about 15 seconds. Then the line stays up but the protocol goes to down and stays down.
Any suggestions I have all the config info just let me know what you would like to look at.
These lines have been out of service for apx 4 weeks or longer, having just started at this firm I would like to repair this quickly.